An ancient trope, still used. Another Dimension refers to universes that are "next" to our own, which require magic or high-end technology to travel to and from. In theory, from our world they are in a direction other than the directions we are familiar with.

This term is actually used incorrectly; "other dimensions" are not locations, but the means by which you get to them.note and let's not talk about "parallel dimensions", which is a contradiction in its own right Our universe, as far as we know, contains four dimensions (length, width, height, and time). We have free movement in the first three, but are locked in a continuous forward motion in the last. Free movement in the fourth dimension is called Time Travel. Free movement in the fifth dimension, or "time squared", is usually seen as jumping sideways from branch to branch within the tree of choices and alternate events that make up the multiverse- so called alternate universes. Basically, if you've ever ended up in an Earth where Hitler won the war, you've travelled in the fifth dimension. The sixth dimension, or "time cubed", is where things get really weird. Because we as a species don't have the capacity to comprehend what the temporal version of "up" is, we tend to see the sixth dimension (or higher) as home to wildly alien places with their own laws of physics where literally ''anything'' can happen.

These are weaponized, used by Gemini Saga and Kanon as a way of removing opponents from the battlefield without much difficulty. Gemini Saga's delivery of the attack tends to be really overblown, to the degree of becoming a Memetic Mutation in some fringes of the fandom.

In Saint Seiya: The Lost Canvas, Saga and Kanon's predecessors display similar aptitude in the art and actually uses it at one point to rob a Physical God of the capacity to control time by simply transporting both of them to a dimension where time doesn't exist.

The page image is from successor series Saint Seiya Omega. The Gold Saint Gemini Paradox can use the attack "Crossroads Mirage" to put the target outside of time and space so she can show them the effects of the choices they have before them. She uses it to try to force Ryuho to decide between betraying his friends or dying through fighting her. The sadistic part comes in that she shows him a utopic future if he betrays them, and thousands dead if he resists. To add extra danger, it is an actual attack, and it puts the victim body and mind between the two choices and will destroy them via psychic pressure unless they decide.

In Yu-Gi-Oh! The Dark Side of Dimensions, Aigami's Quantum Cube can trap people in other dimensions. Anyone not part of the dimension originally will die, and he wants to stop Kaiba and Yugi because if the Pharaoh is reborn into the world people in Aigami's dimension will have no future.

Comic Books

This trope is nearly omnipresent in Super Hero and supernatural comics. A comprehensive list would take up many, many pages.

Mr. Mxyzptlk, of the Superman comics, is from the 5th dimension, a world where everyone's nigh-omnipotent and there's a month called Pants.

In Supergirl story Demon Spawn, Kara is kidnapped and brought to the Innerverse, an alternate dimension created by her dark side which exists inside her mind.

Marvel Comics has an Angler, too; a very minor character with only two appearances, he was radically transformed by being in Another Dimension and though he returns from it, isn't quite suited to "normal" space and tends to be in two places at once. Not to mention crazy, deformed and speaking in weird symbols that look like broken glass.

The old Earth-One and Earth-Two of DC Comics, now replaced by the Fifty-Two.

Although the Fantastic Four often visit the Negative Zone, it's their Ultimate Marvel counterparts who actually use it as part of their Super Hero Origin. And they use the nature of other dimensions as a weapon against Gah Lak Tus.

This is also Marvel's favorite Hand Wave whenever something requires physics-breaking power; The Hulk's extra mass is taken from one, Nightcrawler travels through one when teleporting, and Cyclops gets his eyebeams from one where relativity works differently.

C'hou in With Strings Attached is explicitly set in another dimension; the other planets that the four visit are also in other dimensions. In fact, “universe” and “dimension” are synonymous in this work.

Termina in The Blue Blur of Termina is this to Sonic's Earth, accessible only via a portal deep within the jungles of Adabat.

The Realm of the Gods in The Three Kings: Hunt which was inhabited by the Gods and was invaded by the wizards.

An Emergency! fic called "Double Fantasy" has character John Gage being switched into the "real" world, where he and his whole world are fictional TV show characters, while actor Randolph Mantooth is trapped in John's world, where John and the rest of the characters are real people.

Royal Heights introduces the idea of the Universe which contains all dimensions and allows them to exist. Students of the academy all come from different dimensions and are able to travel to Utopia via a jet fast enough to rip through their home world into a new one.

Films — Animated

Monsters, Inc. shows an alternate universe inhabitated by Monsters that use children's screems as energy source and travel to the human universe by using closet doors.

The original Thomas the Tank Engine show was set on the fictional island of Sodor, which was implied to be located near England. Shining Time Station wasn't as explicit but still treated Sodor like a distant land, but for whatever reason Thomas and the Magic Railroad turned it into an alternate dimension that could only be accessed with special gold dust or something.

Most of the adventures in the Lone Wolf series take place on the world of Magnamund in the plane of Ao. There are other planes of existence such as the Daziarn, a strange dimension divided into mini-dimensions that have almost nothing in common, and the Plane of Darkness, which is basically Hell and the hometurf of Naar the King of the Darkness.

Literature

Edwin Abbot Abbot's Flatland is one of the few examples of the term "another dimension" being used correctly, so perhaps qualifies as a subversion. It is set in a 2D universe where men are geometric shapes, women are straight lines and "up" and "down" are dangerous heresies.

Of Ducks and Universes has an alternate universe (at least one) with alternate selves of people born after a certain date (when the universe split into two.)

Narnia is another dimension in C. S. Lewis's The Chronicles of Narnia series of books, with specific rules about time. Indeed, the sixth book, The Magician's Nephew provides a very good fantasy description of dimensional travel, likening the space between worlds to the rafters in a block of townhouses. The titular magician also makes it clear that Narnia, Charn, and similar worlds have no geographical relationship to our world at all.

Peter F. Hamilton's The Night's Dawn Trilogy incorporates a wide variety of these (scientifically dubbed "continuum's"). The most prominent is the "Beyond", where most souls end up after leaving the body. It's non-spatial, but it has time, so that the souls of the dead are aware of the passage of time but have nothing to do but leech on to each other's memories for the feeble semblance of life that they have.

The Dark Continuum is as close to an actual Hell as it gets. This is a dimension of near-absolute entropy, where the souls of whoever ends up there are compressed into a zero-Kelvin mass of writhing agony called the Melange. In case you are wondering, yes, they are also fully aware.

There are also various "pocket universes", not much bigger in volume than a planet, where the Possessed transport the worlds that they steal.

The Lives of Christopher Chant by Diana Wynne Jones uses a similar "place between" which is clearly written in reaction to The Magician's Nephew's quiet, sleepy Wood Between the Worlds; it's misty, muddy, slippery and somewhat dangerous terrain. There are definitely no guinea pigs.

A Wrinkle in Time features a trio of mysterious guardians who are able to transport the protagonists through space via the fifth dimension. According to them, they are able to tesser, or "wrinkle," by bending space around so that they're in another place in an instant. As one character states: "A straight line is not necessarily the shortest path between two points."

Most of Clive Barker's stories revolve around traveling to and from another dimension, whether through a rug, painting, etc.

The Chronicles of Amber: After walking a sentient maze and gaining the ability to do so (which nearly all the major characters have done), someone from either Amber or Chaos can walk from world to world, essentially willing the transfer from one to another. The transfer is gradual, but can do literally anything, including taking the traveler to a world whose mythology predicts the arrival of a deity who looks exactly like him or her. It's mentioned that no one is quite sure whether these dimensions actually exist before an Amber or Chaos resident enters it, but there is currently a sort of two-ended multiverse with Amber at one end and Chaos at the other, with the hundreds or thousands of worlds in between being more similar the closer they are, to both Amber and Chaos, and each other. And the laws of nature don't always work the same from one to another—for example, gunpowder doesn't ignite in Amber. Oh, and all of them except Amber and Chaos are called Shadows, because it's believed that they are only inter-dimensional shadows of the two true worlds.

In The Boy who Reversed Himself one could get to the fourth dimension by learning to step 'ana' or 'kata' (the extra directions added to make it 4D) and needed special glasses in order to see more than floating blobs, as our eyes weren't designed for the dimension. "Ana" and "kata" are the ancient Greek words for "up" and "down," respectively.

Kay Kenyon's The Entire and The Rose series involves humans discovering a manufactured universe called the Entire. The beings in charge apparently copied sentient species from Earth's universe (the titular Rose) so all the creatures of the Entire supposedly have counterparts elsewhere in our universe that humans just haven't found yet. And there's trouble actually getting to the Entire from the Rose because the beings in charge refuse to share that information. (Those beings themselves and some mysterious attackers called Paion coming from two other universes.)

The Myth Adventures series by Robert Asprin has multiple dimensions between which the protagonists often travel. Also, almost all the protagonists originate in different dimensions (Skeeve from Klah, Aahz from Perv etc.)

Kenneth Bulmer wrote a series about the Contessa Perdita di Monttevarchi, an interdimensional tyrant, and the various people who opposed here

In Wicked Lovely: Sorcha's high court, most halflings and sighted ones, a formerly-mortal dreamwalker named Rae and later Devlin and Ani's 'shadow court' live in a world known only as Faerie. It is also said that the dark court once resided there, but not during the events of the main series.

The Territories in The Talisman. Both worlds tend to mirror each other such that doing one thing in one place causes a similar effect in the other. The inhabitants are also mostly the same apart from population differences.

In Jack Vance's Lyonesse trilogy, there is a long section set in Tanjecterly. It's a strange place where trees are different colors, and the heroine is menaced by grotesque, slime-eating creatures called Progressive Eels.

The concept of another dimension accessible only through special means by special people has been featured in Neil Gaiman's "EverythingHe'sEverWritten".

The Mirrorworld Series: The Mirror World is an alternate version of Europe with 1700's politics...cameras, railroads, and airplanes. The primary mode of travel still appears to be horseback, though, and characters don't recognize modern guns or flashlights. Oh, and there's a whole range of supernatural races...

The Land of Stories take place in a world physically separate from the story’s version of Earth.

Much of The Red And The Rest takes place in Papyrus, the world of lost things. Notable landmarks include an enormous mountain of mismatched socks.

The demons often hailed from some hell dimension or another; our heroes on Angel have visited at least three of them. Most of them have different rules on time. For example, on Buffy a demon continuously captured teens to use as slaves, working them until they're in their old age, then finally dumping them crazed and confused back into our world—all of which happened in a matter of a day or two, Earth-time. Also, Connor was sent to the worst dimension imaginable, and came out a couple weeks later as a teenager.

Glory's world , an H. R. Giger type dimension which we see bits of in the Season 5 finale of Buffy.

There is a running joke about shrimp entirely based on this premise, which has been liberally and enthusiastically embraced by online fandom at large: In "Superstar", when explaining the concept of alternate dimensions, Anya says: "You could have, like, a world with no shrimp. Or with, you know, nothing but shrimp."

In "Triangle", after Olaf was banished she said that he could have been sent to "the world without shrimp."

In the Angel episode "Underneath", Illyria talks about moving between dimensions, she said that she went to "a world with nothing but shrimp" but "tired of it quickly."

The episode "The Wish" introduces an alternate continuity timeline caused by Anyanka, which was supposedly destroyed when her demonic power source was destroyed. But it gets confusing because this alternate timeline is actually ALSO an alternate dimension, since the episode "Doppelg?land" has AU!Willow being pulled from that universe into the primary universe. Just to make it vaguer, the time she gets pulled from is during the events of The Wish; whether the world continues beyond the point where that episode ends is unknown.

Fluidic space, the area inhabited by Species 8472 in Star Trek: Voyager. It's an alternate dimension, only accessed through portals established in the region itself.

Dungeons & Dragons (most notably Forgotten Realms) features planar travel, based on moral alignments, classical elements and various other things. Of course, the world that most of the action takes place in is the "middle ground". Or so all the Clueless berks think 'till they reach the Cage.

Mordenkainen's Magnificent Mansion!

White Wolf's Old World of Darkness games featured another set of dimensions called the Umbra, which was based very strongly on human perception, to the point where a shaman and a scientist in the same part of the deep umbra would see it as a surreal swirling nexus of spirit energy populated with arcane ghosts and a section of interstellar space populated by aliens, respectively.

The New World of Darkness has its own sets of dimensions. There's the Shadow Realm, which is like the Umbra, only it's nearly exclusively animistic. Then there's the Underworld, which is home to dead knowledge and concepts and the place where ghosts go when they've finished their business but aren't ready to pass on to their final reward. Then there's the Abyss, which is pretty much anti-reality. Then there's the five Supernal Realms, dimensions of pure magic. Then there's the Astral Realms, which are where the collective unconscious is made flesh. Then there's Arcadia, which is not the Supernal Arcadia and is a constantly shifting chaotic wasteland that plays home to The Fair Folk. Then there's the Hedge, the predatory gateway dimension between Earth and Arcadia. And on top of all that, apparently there's Hell.

Fate of the Norns: Ragnarok uses the nine worlds of Norse Mythology, located on the branches of the cosmic tree Yggdrasil, each one being its own dimension.

In Atlas Games' Feng Shui, players can travel through time by means of "The Netherworld", an alternate dimension made up of gray tunnels which lead to portals which allow access to and from our world at fixed points in time and space. The Netherworld is home to refugees from alternate timelines that have been erased from reality, including four siblings who ruled the earth in an Alternate History.

The world of The Dark Eye consist of seven planes, generally imagined as concentric spheres. The first is unaccessible and "only" a core. The second is a place of raw elemental powers. The third is the one where all the mortal life happens. The fourth is where the souls of the dead rest. The fifth is where the gods dwell, and cosists the paradises particularly worthy mortal souls may be eccepted into. The sixth is the sky with its stars, and some lesser gods can be found here. The seventh sphere is hell, a realm of chaos and infernal cold (ice/cold being the opposite of life in this world's elemental philosophy). In effect, the entire world, from the gods down, is just a relatively insignificant speck in a universe that wants to destroy it.

In Nomine is a natural for this trope, possessing not only a Heaven and Hell, but also a Dream World known as the Marches, and even a "no-place" called Limbo for the souls of angels/demons who were killed and unable to return to their proper realm.

Many Silent Hill fans agree that the games take place in a place which is like reality but in some crucial ways different, and the term 'alternate dimension' is a convenient term to describe this, though there are many interpretations of just what that actually means and whether 'dimension' should be replaced with some other, more accurate, term.

The Combine from Half-Life 2 are a cabal of dimension-spanning Planet Looters, and the "nearby" — in 11-dimensional superstring terms, at least — Xen border-world is the neighboring dimension by which we discover on our own. Xen itself is nebula-like with giant floating asteroids above a bottomless void (and copious amounts of Scenery Porn). At the end of Half-Life 2 we also get a glimpse of the Combine Overworld which looks like a hellish realm dotted with multiple Citadels.

Xen is also used a a strong plot point since it's a necessary component for Earth-made teleporters. As Mossman explains in HL2, the Resistance "figured out how to use Xen as an unexpressed axis, effectively a "dimensional slingshot" so that we can swing around the border-world and come back into local space without having to pass through". At the end of Half-Life, the dimensional breach left by the resonance cascade was relatively tiny but enough for the Combine who forcibly tore it open and invaded (with the side effects being destructive portal storms and copious amounts of Xen fauna). It was still open in Episode Two when the Combine tried to call in reinforcements but the rebels screwed up their plans and used Black Mesa's old satellite array to seal it permanently.

It's worth noting that Xen isn't a "proper" universe; it's described as a "dimensional travel bottleneck", and is so small, in fact, that its atmosphere is dense enough to be breathable. Add to that the various chunks of planet and the xenofauna from a hundred different worlds, and the impression is that of a "bubble" of spacetime that someone happened to inflate and fill up with just enough material to allow habitability. It's not as unlikely as it sounds, given that we knowthe Nihilanth fled there to escape The Combine.

The Nether is useful for being a quicker way to travel across the land. One block traveled in the Nether is equal to eight blocks traveled in the Overworld. The player can utilize this by constructing a portal in the Overworld leading to the Nether, travelling a certain distance within the Nether, and then constructing another portal leading back to the Overworld. When the player returns to the Overworld, they will have travelled eight times the distance traversed in the Nether.

The Myst games visit 'Ages' such as Stoneship (inhabited ship, embedded in an island), Mechanical (a clockwork fortress on the surface of the ocean), Riven (water on the five islands shies away from heat sources), Spire (flying, wind-carved ruinous mountains floating above a star), and Ahnonay (cleverly designed to appear to travel through time, to the uninitiated).

Two of the alien races from Star Control II come from Another Dimension: the Arilou come from Quasi Space, while the Orz come from a dimension that they refer to only as *below* (thanks to the trouble the Translator Microbes have with their language). The Arilou and the Orz might come from the same dimension, as the Orz say both of the two races are from *outside* and the Arilou are from *above* ("It is the same, but not"). It depends on the meaning of *outside*, though.

April Ryan of The Longest Journey jumps between "our" world (Stark) and the mystic Arcadia repeatedly throughout the game. Interestingly, the game's backstory (explained after the first jump) describes a single world, where magic and science existed together. However, it was foreseen that utilizing both of these would result in the destruction of the world, so, with the help of the Draic Kin, the world was split into two main realities and several smaller "pockets" (either intentional or just leftovers). Stark became a world of science and logic, while Arcadia became a world of magic and chaos. Naturally, only humans beings can live in Stark, who have advanced to Twenty Minutes In The Future, while Arcadia is populated by all manner of fantasy creatures but is stuck in Medieval Stasis. The barrier between the worlds must be constantly maintained, though, as it is clearly unnatural. At some point in the future, the worlds will be re-joined. The major plot point of the game is the fact that, without a Guardian to maintain the Balance, the barrier is starting to break down, with magic seeping into Stark and science seeping into Arcadia. The sequel reveals that, after a new Guardian is installed and repairs the barrier, most of the advanced tech in Stark ceases to function, implying that it's only been functioning thanks to magic (e.g. Artificial Gravity, FTL Travel). At the same time, Arcadia reverts to typical Medieval tech (with all the new "toys" spread by the Vanguard no longer working thanks to the laws of nature being in flux), except for Azadi Magitek, which uses magic to allow certain primitive pieces of technology to function.

In City of Heroes, quite a few of the high-level missions involve visiting other dimensions or fighting invaders from them.

As well as the Shadow Shard, a series of 4 zones set in an alternate dimension that may very well be the mind of a god, inhabited by aspects of his personality.

Also, there is the interdimensional dance club Pocket D, a neutral zone where heroes and villains can get together but are incapable of attacking one another.

There's a very literal example in Super Paper Mario where Mario's special move is to "warp" the otherwise flat world, revealing its third dimension. There's also Bestovius, Dimentio and Merloo, who all have dimension-flipping powers! It's quite popular in this game.

In the original SNES Star Fox, there is a secret level titled "Out Of This Dimension" that has to be seen to be believed.

In Runescape, there exists a series of gates to the Fairy dimension Zanaris, which itself has a central 'hub' to travel to other, decidedly more hostile dimensions, such as the Abyssal Zone, Dimension X, which is host to horned kangaroos, and even a forest. A forest dimension.

The Dark Place from Alan Wake is a bizarre realm "beyond the shores of our reality". It is home to more than a few dark entities of calamitous intentions and it is by nature "fluid", constantly shifting according to the whims and thoughts of its inhabitants; works of art created here or at contact points with our reality (such as Cauldron Lake) can influence reality by coming true. The protagonist, a novelist, writes a book that comes true over the course of the game, and once in the Dark Place itself, finds himself surrounded by words and ideas that he can turn into physical reality, and manifestations of his own fear and hopelessness coming to kill him. It's stated repeatedly that even though signals can travel from it to our reality, once you're in the Dark Place, it is next to impossible to leave, at least withou bringing something terrible along with you. By the time of Alan Wake's American Nightmare, two years after the first game, Wake has become much more adept at handling the Dark Place and its inhabitants. He is able to write himself as one of the protagonist of one of his works and travel back to our reality at a point of contact (this time near a town in Arizona), but it's hinted that this is not an actual escape and it's not even clear if the events of the game actually took place.

In Corpse Party, the main characters are transported to another dimension.

Clive Barker's Undying has both Oneiros and Eternal Autumn, magical realms that are either enslaved or created by two mages in the story, Keisinger and Bethany.

In the Sonic the Hedgehog series, while the two Sonic Rush games feature an Alternate Universe, Sonic Rivals 2 is about Eggman Nega plotting to free a demon that was trapped in Another Dimension Some theories and other media sources suggest that the Special Zone is Another Dimension. There's also the Twilight Cage from Sonic Chronicles, which seems to collect powerful civilizations from several dimensions.

Magician's Quest: Mysterious Times has the spirit world, which crosses over with the real world during Mystery Time. During Mystery Time, new bugs and fish appear (including VAMPIRE SQUID), characters from the spirit world appear in the town and require your help, and Mr. Graves (the sleeping skeleton in the room with the organ and locker) wakes up to teach extracurricular classes. Oh yeah, did I mention that the sky turns an otherworldly shade of red?

Duel Savior Destiny begins when Taiga and his sister are both dragged into the root world by a mysterious red book. It appears to be much smaller and less populous than Earth, but as the core world whatever happens there happens to the outer worlds eventually.

The later installments of the Dark Parables series have begun sending the detective into these. The fourth game had her visit "Fairy Tale Land," and the fifth game trapped her for almost half the game in the "Mirror World."

The Surface game series by Elephant Games are built on this trope. The premise of the games featured the protagonist getting transported to another dimension, usually by supernatural means, and figuring out how to get home. Each game had its own spin on the alternate dimension and stand alone in the series.

The 10th Dimension in Crash Twinsanity. Containing twisted versions of (at least) N.Sanity Island & Slip-Slide Icecapades. May also count as a Dark World due to the similarities when compared to the regular dimension.

Every Plane of Existence in Nexus Clash is a piece of reality pulled from the 'real' world which player characters, being trapped in the Cycle, never see to act as part of the battlefield to shape the next world. Elysium and Stygia in particular are Alternate World Maps to each other, separated only by how they are perceived.

The Mortal Kombat series is set in a universe which has many realms, Earth being one of them. The main conflict of the series comes from evil warlords and gods who want to subjugate every realm, including our own, and enslave the very souls of their people.

Evolve contains multiple dimensions, but only two are relevant. One is the one the game is set in, a futuristic setting where humans have expanded through the universe, and the other is a dimension without mass or corporeal form inhabited by a hive mind species of Energy Beings. The plot happens when the Reality Warping technology used by humans inadvertently devastates the corresponding areas in the other dimension, causing the energy beings to emerge into the human dimension and develop physical forms in order to eliminate the cause of the disturbance.

Web Comics

In RetroBlade there is a 4th Dimension where the Universal Guardian resides, and where Magnus first obtains the 4D Sword.

Enemy Quest's Visitors opened a portal from their dimension to earth and started invading. They have their own world back in their dimension: a planet mostly covered in water with a single supercontinent à la Pangaea.

Sluggy Freelance introduced the Dimensional Flux Agitator, a device that opens portals to other dimensions at random, in its second chapter. The device has been brought back many times since then, to the point where a full fledged multiverse has developed.

In Alice and the Nightmare, the Wonderland exists alongside Earth and there's some cultural exchange between the two, although it seems that Earth people don't know about Wonderland.

Web Original

The Torn World is depicted this way in Dino Attack RPG. It is a mysterious dimension where bricks go when they are torn out of the Constructopedia. For some reason every piece breaks up into single-stud bricks (though people are not affected by this phenomenon), which float in the middle of an empty void resembling space, though anything else is still affected by gravity.

The Gamer's Alliance has several planes of reality, including the Land of the Living, the Land of the Dead, the Void, the High Plane, and the Demon Realm among others.

One famous Halloween episode of The Simpsons has Homer entering the third dimension. After causing that dimension to collapse, he ends up in the "real" world, "the worst place yet." Like many Simpsons Halloween sketches, this was a parody of a The Twilight Zone (1959) episode.

Raven of the Teen Titans comes from one of these. She has threatened to deport BeastBoy to Another Dimension. She goes to what certainly looks like Another Dimension to deliver a glorified cell phone. Maybe it's so easy for her because she is a living, humanoid interdimensional portal.

In Jonny Quest: The Real Adventures episode "Other Space," scientists open a portal to another dimension, complete with inhabitants that want to take over our dimension.

In the W.I.T.C.H. TV show and comics that inspired it the Five Girl Band are appointed as Guardians of the Veil (later Guardians of the Infinite Dimensions in the show to police their Multiverse and prevent various bad guys and the occasional Eldritch Abomination from messing things up. In this case "dimensions" seems to mean planes of existence instead of alternate universes as Human Aliens are rarely encountered. Most dimensions fit the fantasy archetype to some degree or another but one world in the comics was an almost literal case of Alien Geometries.

The Cowboy Universe from Futurama is identical to our own, except everyone is dressed like a cowboy. While it's described as the only parallel universe in existence, later episodes RetConned it. So it's most likely an Alternate Dimension, given that it's viewable from the edge of the universe.

Avatar: The Last Airbender has the Spirit World, a dimension parallel to the one the characters live in. It's home to most of the Avatar world's spirits, and the former incarnations of the Avatar itself, and seems to operate on a completely different kind of physics. The titular Avatar is the bridge between the show's two dimensions, as a fusion of a human and the Big Good spirit of light and peace, Raava. We only ever see Aang visit the Spirit World, but Sokka apparently got stuck there for 24 hours, and it's heavily implied that Iroh has been there as well, presumably indicating anyone can get there if they try hard enough. There are also several spirits (Wan Shi Tong, Tui, La, and Hei Bai) who have visited the physical world.

The Legend of Korra expands the Spirit World first seen in Avatar. After his death, Iroh Ascended to a Higher Plane of Existence and ended up there. Spirit portals are opened and created, leading to thousands of spirits living in the material world, and many regular people like Zaheer, Aiwei, and Jinora are capable of meditating there.

Dr. Dimensionpants features multiple other dimensions that excist besides the one the hero hails from.

My Little Pony: Friendship Is Magic has the starry realm that Twilight went to when she ascended to alicorn status. Also, in 'Make New Friends but Keep Discord' it is revealed Discord can open portals into other dimensions, one of which he lives in, and one of which contains live-action sock puppets.

Shogoth, the demon from "A Demon in His Pocket", evidently comes from another dimension. However, the dimension in question is only glimpsed briefly towards the end when Shogoth decides he would rather go home than serve Ming - and have to face the Defenders again.

The Shadow Void from "The Evil of Doctor Dark" and its sequel, "The Return of Doctor Dark"

The Nightworld from "Doorways into Darkness", where Ming plans to unleash the Night Giants on Earth

Bodhidama from "The Gods Awake". Mandrake lures the destroyer god Shiva into Bodhidama, but seems set to lose the battle (and his life) until his mentor contacts him and tells him that, while he is in Bodhidama, his normally illusory powers are real.

The Land of Magic from "The Mystery of the Book", the last episode in the "Book of Enigmas" arc

Graviton, the main antagonist in the "Necklace of Oros" arc, comes to Earth from another dimension to reclaim the titular necklace, which spends most of the arc in Jedda's possession.

Several episodes of The Real Ghostbusters deal with other dimensions, many of the "ghosts" seen in the show are not really spirits of the dead but life forms from other dimensions. Some of the episodes that deal with this are: Flip Side (which also works as the Mirror Universe episode) with a world were ghost are normal citizens and humans are the ones that scares, Venkman's Ghost Repellers shows a Bermuda Triangle expy called The New Jersey Parallelogram, Who're You Calling Two-Dimensional? shows that there is an entire dimension inhabitated by cartoon characters, Chicken, He Clucked shows a multiverse with many dimensions and one of them has all the chickens in the world after a man who hate chickens make a Deal with the Devil in order to make them disappear from Earth, The Cabinet of Calamari shows a dimension connected troughout a magician's box and You Can't Teach an Old Demon New Tricks similar to the latter, a demon living in other dimension connected through a magician's cabinet wants to learn magic tricks but is unable to as only magicians assistants and white doves come from the cabinet until the Ghosbusters get there, etc. Even the Containment Unit can be considered another dimension as is Bigger on the Inside and seems to be a ghostly realm.

Real Life

In string theory, which is the highly speculative Hot New Thing in theoretical physics for the last few years, our visible cosmos is located in a ten- or eleven-dimensional hyperspace, which may contain an arbitrary number of other continua, with varying kinds of matter, forces, and numbers of dimensions.

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